ANDROID: dm verity fec: add missing release from fec_ktype

Add a release function to allow destroying the dm-verity device.

Bug: 27928374
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Change-Id: Ic0f7c17e4889c5580d70b52d9a709a37165a5747
(cherry picked from commit 0039ccf47c8f99888f7b71b2a36a68a027fbe357)
diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c
index b1ddd15..0d7669c 100644
--- a/drivers/md/dm-verity-fec.c
+++ b/drivers/md/dm-verity-fec.c
@@ -687,7 +687,8 @@
 
 static struct kobj_type fec_ktype = {
 	.sysfs_ops = &kobj_sysfs_ops,
-	.default_attrs = fec_attrs
+	.default_attrs = fec_attrs,
+	.release = dm_kobject_release
 };
 
 /*